Support compiling to wasm in `build_web_compilers` #26

Job	Run time
health / coverage	0s
health / license	0s
health / breaking	0s
health / leaking	0s
health / changelog / run changelog health check	32s
health / version / run version health check	16s
health / do-not-submit / run do-not-submit health check	33s
health / comment	5s
	1m 26s

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